ADVANCED DRAINAGE SYSTEMS, INC.·4

May 21, 6:35 PM ET

MAKOWSKI TIM A 4

4 · ADVANCED DRAINAGE SYSTEMS, INC. · Filed May 21, 2026

Research Summary

AI-generated summary of this filing

Updated

Advanced Drainage Systems (WMS) VP Controller Tim Makowski Receives Award

What Happened
Tim A. Makowski, Vice President, Controller and Chief Accounting Officer of Advanced Drainage Systems (WMS), was granted and received 3,729 shares on 2026-05-20 as performance-based units that vested. To cover tax obligations, 104 shares were withheld on 2026-05-19 at $131.59 ($13,685) and 88 shares were withheld on 2026-05-20 at $136.83 ($12,041). The award included 53 dividend-equivalent shares. Net impact: a gain of 3,537 shares (3,729 granted − 192 withheld). The shares were acquired as an award (not an open-market purchase).

Key Details

  • Transaction dates and prices:
    • 2026-05-19: 104 shares withheld at $131.59 each = $13,685 (tax withholding)
    • 2026-05-20: 88 shares withheld at $136.83 each = $12,041 (tax withholding)
    • 2026-05-20: 3,729 shares granted/received at $0 (performance-based award)
  • Net change: +3,537 shares (3,729 acquired minus 192 withheld)
  • Shares owned after transaction: not specified in the filing; net increase reported above
  • Footnotes:
    • F1: Withheld shares used to satisfy tax obligations on vesting
    • F2: Grant reflects performance-based units earned under the 2017 Omnibus Incentive Plan; includes 53 dividend-equivalent shares settled in common stock
    • F3: Represents current allocation under KSOP
  • Filing timeliness: Reported on 2026-05-21 for transactions on 2026-05-19 and 05-20 — appears timely (filed within SEC Form 4 reporting window)

Context: This was a settlement of earned performance-based units (routine compensation vesting) with shares withheld to cover taxes. Such withholding is a standard administrative step and does not necessarily indicate the insider buying or selling shares in the open market.

Insider Transaction Report

Form 4
Period: 2026-05-19
MAKOWSKI TIM A
See Remarks
Transactions
  • Tax Payment

    Common Stock

    [F1]
    2026-05-19$131.59/sh104$13,6852,363 total
  • Tax Payment

    Common Stock

    [F1]
    2026-05-20$136.83/sh88$12,0412,275 total
  • Award

    Common Stock

    [F2]
    2026-05-20+3,7296,004 total
Holdings
  • Common Stock

    [F3]
    (indirect: By KSOP)
    17,556.871
Footnotes (3)
  • [F1]Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.
  • [F2]Reflects grant of performance-based units, originally granted pursuant to the Issuer's 2017 Omnibus Incentive Plan, earned after the Issuer determined that certain performance goals for the performance period ended March 31, 2026 had been met. Total includes dividend equivalents in the amount of 53 shares, which dividend equivalents are settled in common stock.
  • [F3]Represents current allocation under KSOP.
Signature
/s/ Tim A. Makowski, by Scott A. Cottrill as attorney-in-fact|2026-05-21

Documents

1 file
  • 4
    ownership.xmlPrimary

    4